The court that oversees US surveillance has ordered the government to review for declassification a set of secret rulings about the National Security Agency’s bulk trawls of Americans’ phone records, acknowledging that disclosures by the whistleblower Edward Snowden had triggered an important public debate.

The Fisa court ordered the Justice Department to identify the court’s own rulings after May 2011 that concern a section of the Patriot Act used by the NSA to justify its mass database of American phone data. The ruling was a significant step towards their publication.

It is the second time in a week that a US court has ordered the disclosure of secret intelligence rulings.